The string class of C + + face question

#include <utility> #include <string.h> class string{public:string (): Data_ (new char[1]) {*data_ = '  ";  } String (const char* str): Data_ (new Char[strlen (str) + 1]) {strcpy (Data_, str);  } String (const string& RHS): Data_ (New Char[rhs.size () + 1]) {strcpy (Data_, Rhs.c_str ()); }/* Delegate constructor in c++11 string (const string& RHS): string (rhs.data_) {} */~string () {dele  Te[] Data_;    }/* traditional:string& operator= (const string& RHS) {String tmp (RHS);    Swap (TMP);  return *this;    } */string& operator= (String RHS)//Yes, Pass-by-value {swap (RHS);  return *this;  }//C + + String (string&& RHS): Data_ (rhs.data_) {rhs.data_ = nullptr;    } string& operator= (string&& rhs) {swap (RHS);  return *this;  }//accessors size_t size () const {return strlen (Data_);  } const char* C_STR () const {return data_; } void Swap (string&amP  RHS) {Std::swap (Data_, Rhs.data_); } private:char* Data_;};

The string class of C + + face question